EP 3395991 A1 20181031 - HIGH STRENGTH SEAMLESS STAINLESS STEEL PIPE FOR OIL WELLS AND MANUFACTURING METHOD THEREFOR
Title (en)
HIGH STRENGTH SEAMLESS STAINLESS STEEL PIPE FOR OIL WELLS AND MANUFACTURING METHOD THEREFOR
Title (de)
HOCHFESTES NAHTLOSES EDELSTAHLROHR FÜR ÖLBOHRUNGEN UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TUBE SANS SOUDURE À RÉSISTANCE ÉLEVÉE EN ACIER INOXYDABLE POUR PUITS DE PÉTROLE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2015249956 A 20151222
- JP 2016129714 A 20160630
- JP 2016004609 W 20161018
Abstract (en)
Provided herein is a high-strength seamless steel pipe for oil country tubular goods having excellent sulfide stress corrosion cracking resistance. The high-strength seamless steel pipe for oil country tubular goods contains C: 0.20 to 0.50 mass%, Si: 0.05 to 0.40 mass%, Mn: 0.1 to 1.5 mass%, P: 0.015 mass% or less, S: 0.005 mass% or less, Al: 0.005 to 0.1 mass%, N: 0.006 mass% or less, Cr: 0.1 to 2.5 mass%, Mo: 0.1 to 1.0 mass%, V: 0.03 to 0.3 mass%, Nb: 0.001 to 0.030 mass%, B: 0.0003 to 0.0030 mass%, O: 0.0030 mass% or less, and Ti: 0.003 to 0.025 mass%, and satisfies Ti/N = 2.0 to 5.5. The high-strength seamless steel pipe has a volume fraction of tempered martensite of 95% or more, and a prior austenite size number of 8.5 or more, and contains nitride inclusions which have a size of 4 µm or more and whose number is 100 or less per 100 mm 2 , nitride inclusions which have a size of less than 4 µm and whose number is 700 or less per 100 mm 2 , oxide inclusions which have a size of 4 µm or more and whose number is 60 or less per 100 mm 2 , and oxide inclusions which have a size of less than 4 µm and whose number is 500 or less per 100 mm 2 , in a cross section perpendicular to a rolling direction.
IPC 8 full level
C21D 1/18 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP US)
C21D 1/18 (2013.01 - EP US); C21D 8/105 (2013.01 - EP US); C21D 9/085 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/32 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3395991 A1 20181031; EP 3395991 A4 20181031; EP 3395991 B1 20230412; BR 112018012400 A2 20181204; BR 112018012400 B1 20200218; MX 2018007692 A 20180801; US 11186885 B2 20211130; US 2019024201 A1 20190124; WO 2017110027 A1 20170629
DOCDB simple family (application)
EP 16877932 A 20161018; BR 112018012400 A 20161018; JP 2016004609 W 20161018; MX 2018007692 A 20161018; US 201616064086 A 20161018